For more years than I am willing to admit I have gone to my local hardware store to buy a dozen outdoor spotlight bulbs for a 10% volume discount (buy local). At first I didn't notice, but after the passage of time I realized that the bulbs were blowing with cash register regularity. Being somewhat thrifty or penurious, I eschewed local loyalty and went to Home Depot looking for a more reliable, new fangled, longer-lasting bulb. 

The result? Glory be!  I should live so long!  I can't wait to change one of these years and years bulbs!